#include <57header.h>

int main(int argc,char*argv[])
{

    if(fork() == 0){
        sleep(1);
        printf("son_pid: %d , group_id: %d \n", getpid(), getpgrp());
    }else{
        printf("mian_pid: %d , group_id: %d \n", getpid(), getpgrp());
    }
    return 0;
}

